If you need the unused DLUs included let Cisco licensing know about it, they may ask you to provide all PAKs, POs, etc. if you don't have them just explain that to them and in my experience as long as customer is under UCSS and the numbers under support are close enough Cisco will issue what you desire.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.